This is definitely an interesting case where your product suffers through external factors. Things like languages being EOL'd (python), technology becomes obsol

This is definitely an interesting case where your product suffers through external factors. Things like languages being EOL'd (python), technology becomes obsolete (like you mention here), vendor forcing change through API and security change through OS upgrade (iOS), and security CVE issues. These all cause sustaining to be done to older code in unexpected ways.